[PATCH 2/2] [X86] Fix a compilation issue with clang.
From: dl9pf
Date: Thu Aug 29 2013 - 15:15:31 EST
From: Jan-Simon MÃller <dl9pf@xxxxxx>
Clang does not support the "shortcut" we're taking here for gcc (see below).
The patch uses the macro _ASM_DX to do the job.
>From arch/x86/include/asm/uaccess.h:
/*
* Careful: we have to cast the result to the type of the pointer
* for sign reasons.
*
* The use of %edx as the register specifier is a bit of a
* simplification, as gcc only cares about it as the starting point
* and not size: for a 64-bit value it will use %ecx:%edx on 32 bits
* (%ecx being the next register in gcc's x86 register sequence), and
* %rdx on 64 bits.
*/
Signed-off-by: Jan-Simon MÃller <dl9pf@xxxxxx>
CC: pageexec@xxxxxxxxxxx
CC: llvmlinux@xxxxxxxxxxxxxxxxxxxxxxxxx
CC: behanw@xxxxxxxxxxxxxxxxxx
CC: hpa@xxxxxxxxx
CC: linux-kernel@xxxxxxxxxxxxxxx
---
arch/x86/include/asm/uaccess.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 8fa3bd6..32432d1 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -163,7 +163,7 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
#define get_user(x, ptr) \
({ \
int __ret_gu; \
- register __inttype(*(ptr)) __val_gu asm("%edx"); \
+ register __inttype(*(ptr)) __val_gu asm("%"_ASM_DX); \
__chk_user_ptr(ptr); \
might_fault(); \
asm volatile("call __get_user_%P3" \
--
1.8.1.4
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